According to Daily Mail Australia, Ibby and Romel entered Tuesday's challenge with a scoring advantage after winning the People's Choice award at the Pop Up Restaurant earlier this week.
The perk allowed the controversial pair to award 20 points instead of the 10 available to their rival.
Discussing their sneaky plan, Ibby told Romel: "Regardless of how the food is, I think we need to vote smart."
Romel agreed and they voted accordingly, and despite the judges awarding them higher marks it was Anne and Jennifer who were sent home thanks to Ibby and Romel's strategic meddling.
Statistician Bianca spotted a flaw in the score numbers, demanding to know "how does that even work mathematically?".
A defensive Romel snapped: "You can't make assumptions."
To which Bianca coolly hit back: "I can - it's mathematical."